To Truncate Or Not To Truncate: That Is The Question..
Apr 17, 2008
Hi all...
Please forgive the elementary nature of my question, but could someone please explain the differences between these two database backup types:
1. Log backup
2. Log backup no truncate
From what I understand and have read, the "no truncate" backup method keeps the entire transaction log indefinitely. Using the truncation method, the transaction log is either 1) compressed or 2) cleaned up so that any completed transactions are removed from the log. Which one of these is true?
And, for the big question: is it better to run a backup of the transaction log with truncation or not? Our current backup scheme is similar to the following:
Full backup every 24 hours
transaction log backup every hour with no truncation
Should we insert a truncation backup somewhere in here? What is the danger of removing (or compressing) parts of the transaction log? Will this affect the restore process?
Thanks in advance!
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Dec 30, 2004
With a database size of almost 2 GB, I run the 'truncate table eventlog command' which completes successfully, but the database size only decreases by about 10 MB so stays too large - indeed the number of rows in the eventlog table is minimal, but the otehr tables in this database don't show such an amount of tables large enough to cause the size issue either. What could be the reason and how can I reduce it (possibly truncating another table but then which one, how could I determine which is too large and needs truncating?).
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Aug 1, 2007
i read that i can Truncate a table even if child table has no records so i tries to disable constraints but still can't get it to workCannot truncate table 'InventoryPC' because it is being referenced by a FOREIGN KEY constraint. disabling code on lines 9-13 and enabling codes on 36-40 1 ALTER PROCEDURE dbo.RevertDB
2
3 /* Reverts Database to original "Clean" State */
4 AS
5 SET NOCOUNT OFF
6 DECLARE @Log AS varchar(MAX), @RowsInDB AS int
7 SET @Log = 'RevertDB Started at ' + CAST(GETDATE() AS varchar(50)) + ''
8
9 /* *** Disable Constraints *** */
10 ALTER TABLE Booking NOCHECK CONSTRAINT ALL
11 ALTER TABLE InventoryPC NOCHECK CONSTRAINT ALL
12 ALTER TABLE PC NOCHECK CONSTRAINT ALL
13 ALTER TABLE Platform NOCHECK CONSTRAINT ALL
14
15 /* *** Start Truncates *** */
16 TRUNCATE TABLE Booking
17 SET @Log = @Log + 'Trucate Table Booking - Done' + ''
18 SET @RowsInDB = (SELECT COUNT(BookingID) FROM Booking)
19 SET @Log = @Log + '-- Rows Affected: ' + CAST(@@ROWCOUNT AS varchar(10)) + ', Rows in Table: ' + CAST(@RowsInDB AS varchar(10)) + ''
20
21 TRUNCATE TABLE InventoryPC
22 SET @Log = @Log + 'Trucate Table InventoryPC - Done' + ''
23 SET @RowsInDB = (SELECT COUNT(InventoryID) FROM InventoryPC)
24 SET @Log = @Log + '-- Rows Affected: ' + CAST(@@ROWCOUNT AS varchar(10)) + ', Rows in Table: ' + CAST(@RowsInDB AS varchar(10)) + ''
25
26 TRUNCATE TABLE PC
27 SET @Log = @Log + 'Trucate Table PC - Done' + ''
28 SET @RowsInDB = (SELECT COUNT(PCID) FROM PC)
29 SET @Log = @Log + '-- Rows Affected: ' + CAST(@@ROWCOUNT AS varchar(10)) + ', Rows in Table: ' + CAST(@RowsInDB AS varchar(10)) + ''
30
31 TRUNCATE TABLE Platform
32 SET @Log = @Log + 'Trucate Table Platform - Done' + ''
33 SET @RowsInDB = (SELECT COUNT(PlatformID) FROM Platform)
34 SET @Log = @Log + '-- Rows Affected: ' + CAST(@@ROWCOUNT AS varchar) + ', Rows in Table: ' + CAST(@RowsInDB AS varchar(10)) + ''
35
36 /* *** Enable Constraints *** */
37 ALTER TABLE Booking WITH CHECK CHECK CONSTRAINT ALL
38 ALTER TABLE InventoryPC WITH CHECK CHECK CONSTRAINT ALL
39 ALTER TABLE PC WITH CHECK CHECK CONSTRAINT ALL
40 ALTER TABLE Platform WITH CHECK CHECK CONSTRAINT ALL
41
42 SET @Log = @Log + '*** End Truncates ***' + ''
43 /* *** End Truncates *** */
44
45 /* *** Start Insert Platform *** */
46 SET @Log = @Log + 'Start Insert Platform' + ''
47
48 EXEC dbo.InsertPlatform 'Windows XP SP2 Professional Edition', 'Some description for Windows XP SP2 Professional Edition over here …'
49 EXEC dbo.InsertPlatform 'Windows Vista Ultimate', 'See everything you''re working on more clearly with Windows Aero, and quickly switch between windows or tasks using Windows Flip 3D and Live Thumbnails. You can easily find what you need—when you need it―with Instant Search and live icon previews that display the actual contents of your files. And while you''re at it, give your personal productivity a boost with instant access to the information you care about using Windows Sidebar and Gadgets. Put these easy-to-use and customizable mini-applications on your desktop and reveal the information you''re looking for at a glance.Website: http://www.microsoft.com/windows/products/windowsvista/seeit/default.mspx'
50 EXEC dbo.InsertPlatform 'Apple Mac OS X Tiger', 'Some description for Apple Mac OS X Tiger over here …'
51 EXEC dbo.InsertPlatform 'Apple Mac OS X Leopard', 'Desktop: The new look of Leopard showcases your favorite desktop image and puts new file Stacks at your fingertips for a stunning, clutter-free workspace.Finder: Browse your files like you browse your music with Cover Flow.Time Machine: See how your system looked on any given day and restore files with aWebsite: http://www.apple.com/macosx/leopard/features/'
52 EXEC dbo.InsertPlatform 'Red Hat Linux', 'Some description for Red Hat Linux over here …'
53
54 SET @Log = @Log + 'Rows In Platform: ' + (SELECT COUNT(PlatformID) FROM Platform) + ''
55 /* *** Start Insert PC *** */
56 SET @Log = @Log + 'Start Insert PC' + ''
57
58 DECLARE @WinXP int, @WinVista int, @OSXTiger int, @OSXLeopard int, @RedHat int
59 SET @WinXP = (SELECT PlatformID FROM Platform WHERE Title = 'Windows XP SP2 Professional Edition')
60 SET @WinVista = (SELECT PlatformID FROM Platform WHERE Title = 'Windows Vista Ultimate')
61 SET @OSXTiger = (SELECT PlatformID FROM Platform WHERE Title = 'Apple Mac OS X Tiger')
62 SET @OSXLeopard = (SELECT PlatformID FROM Platform WHERE Title = 'Apple Mac OS X Leopard')
63 SET @RedHat = (SELECT PlatformID FROM Platform WHERE Title = 'Red Hat Linux')
64
65 EXEC dbo.InsertPC 'Fusion PC One', 'Description here ...', 'Intel Core2 Duo E6600 2.4 GHz 1066MHz', '1GB Dual Channel DDR2 667 SDRAM', '120GB SATA2 NCQ HDD', 'NVIDIA GeForce 8600 256MB GDDR3', '22" 3000:1 Wide Screen LCD', @WinXP
66 EXEC dbo.InsertPC 'Fusion PC Two', 'Description here ...', 'Intel Core2 Duo E6850 3 GHz 1333MHz', '2GB Dual Channel DDR2 800 SDRAM', '240GB SATA2 NCQ HDD', 'NVIDIA GeForce 8800 Ultra 256MB GDDR3 SLI', '24" 3000:1 Wide Screen LCD', @WinVista
67 EXEC dbo.InsertPC 'Fusion PC Three', 'Description here ...', 'AMD Athlon 64 X2 Dual Core 6000+ 3 GHz', '2GB Dual Channel DDR2 667 SDRAM', '240GB SATA2 NCQ HDD', 'ATI Radeon Cross Fire 2900 256MB GDDR3', '24" 3000:1 Wide Screen LCD', @WinVista
68 EXEC dbo.InsertPC 'Fusion X1', 'Description here ...', 'Intel Core2 Extreme Q6850 3 GHz 1333MHz', '6GB Dual Channel DDR2 800 SDRAM', '500GB SATA2 NCQ HDD', 'NVIDIA GeForce 8800 Ultra 256MB GDDR3 SLI', '30" 3000:1 Wide Screen LCD', @OSXLeopard
69 EXEC dbo.InsertPC 'Fusion X2', 'Description here ...', 'AMD Athlon 64 FX 74 3 GHz', '6GB Dual Channel DDR2 800 SDRAM', '500GB SATA2 NCQ HDD', 'NVIDIA GeForce 8900 Ultra SLI 256MB GDDR3', '30" 3000:1 Wide Screen LCD', @WinVista
70 EXEC dbo.InsertPC 'Fusion Tiger 1', 'Description here ...', 'Intel Core2 Duo E6600 2.4 GHz 1066MHz', '2GB Dual Channel DDR2 800 SDRAM', '120GB SATA2 NCQ HDD', 'NVIDIA GeForce 8600 256MB GDDR3 SLI', '22" 3000:1 Wide Screen LCD', @OSXTiger
71 EXEC dbo.InsertPC 'Fusion Linux 1', 'Description here ...', 'AMD Athlon 64 X2 6000+ 3 GHz', '1GB Dual Channel DDR2 800 SDRAM', '120GB SATA2 NCQ HDD', 'NVIDIA GeForce 8600 256MB GDDR3', '22" 3000:1 Wide Screen LCD', @RedHat
72
73 SET @Log = @Log + 'Rows In PC: ' + (SELECT COUNT(PCID) FROM PC) + ''
74
75 /* *** Start Insert Inventory *** */
76 SET @Log = @Log + 'Start Insert Inventory' + ''
77
78 DECLARE @F1 int, @F2 int, @F3 int, @FX1 int, @FX2 int, @FT1 int, @FR1 int
79 SET @F1 = (SELECT PCID FROM PC WHERE Title = 'Fusion PC One')
80 SET @F2 = (SELECT PCID FROM PC WHERE Title = 'Fusion PC Two')
81 SET @F3 = (SELECT PCID FROM PC WHERE Title = 'Fusion PC Three')
82 SET @FX1 = (SELECT PCID FROM PC WHERE Title = 'Fusion X1')
83 SET @FX2 = (SELECT PCID FROM PC WHERE Title = 'Fusion X2')
84 SET @FT1 = (SELECT PCID FROM PC WHERE Title = 'Fusion Tiger One')
85 SET @FR1 = (SELECT PCID FROM PC WHERE Title = 'Fusion Linux One')
86
87 EXEC dbo.InsertInventory 10, @F1, 2.5, 'iCluster Fusion One'
88 EXEC dbo.InsertInventory 10, @F2, 2.5, 'iCluster Fusion Two'
89 EXEC dbo.InsertInventory 10, @F3, 2.5, 'iCluster Fusion Three'
90 EXEC dbo.InsertInventory 6, @FX1, 6, 'iCluster Fusion X1'
91 EXEC dbo.InsertInventory 6, @FX2, 6, 'iCluster Fusion X2'
92 EXEC dbo.InsertInventory 10, @FT1, 3, 'iCluster Fusion Tiger One'
93 EXEC dbo.InsertInventory 30, @FR1, 2, 'iCluster Fusion Linux One'
94
95 SET @Log = @Log + 'Rows In Inventory: ' + (SELECT COUNT(InventoryID) FROM InventoryPC) + ''
96
97 RETURN @Log
98
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Nov 23, 1999
I would like to ask if I backuped the transaction log already, SQL will truncate the transaction log automatically or not. If not what should I do?
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Nov 19, 2001
Is there an ISQL statement to truncate the transaction log??? A Stored Procedure maybe?
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Jan 8, 2005
I have two tables in my SQL CE database. tblTempData and tblBatchData. When the user wants to move the data from 'temp' into 'batch' I would like to truncate the 'temp' table. When I do this I get the unable to parse query error.
strSQL = "TRUNCATE TABLE tblTempData"
goADOcn.Execute (strSQL)
Is there something that I am doing wrong, or is TRUNCATE not supported in SQLCE 2000?
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Dec 29, 2005
can TRuncate statement be rolled back ?
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May 1, 2006
Does anyone know how to truncate log without grow up space used?
Thanks
Sbahri
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May 13, 2004
Hi there,
I have a simple stored procedure that will truncate the log file but I now need to make this dynamic so that this proc can be run with any DB name. I know you can look up the logical filename in sysfiles but I'm not too sure how to write this procedure so that it will simply truncate the log file of the currently selected DB.
This is what I have so far which as you can see is hardcoded:
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_NULLS OFF
GO
CREATE PROCEDURE TruncateLog AS
BACKUP LOG [FICaches] with TRUNCATE_ONLY
DBCC SHRINKFILE (FICaches_log, 50)
GO
SET QUOTED_IDENTIFIER OFF
GO
SET ANSI_NULLS ON
GO
Any help would be greatly appreciated!
Thanks
NewToSql
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May 13, 2008
Hi
I have a Log which is 15 gb. Recovery mode is simple.
What command can I use to truncate this log? Or is it best to shrink it?
Thanks
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May 26, 2008
I have a small doubt .
Truncate is not a logged operation.
In log shipping if we perform any truncate operation on the primary server will its get reflected on the secondary server.
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Jun 13, 2008
I have 2 tables.
Table 1 and table 2.
Table 1 has a foreign key related to a particular column on table 2.
Suppose if i have applied a truncate command on table 2 .will it work or not.
We have to check for dependencies on the table before we should apply a truncate command.
Could any one tell me can we directly apply a truncate command on any object irrespective of the dependencies on that object.
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Dec 13, 2007
How to setup a sql 2005 maint plan for truncate log ?
Is it possible or do need to create a job and and in job step mention below
Backup log DatabaseName with truncate_only
How do i issue the checkpoint?
...please let me know?
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Dec 14, 2007
I need to truncate log for one DB
do i need to create a job and and in job step mention below
Backup log DatabaseName with truncate_only
is there any other way to do this?
How do i issue the checkpoint?
...please let me know?
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Mar 22, 2007
Hello All,
I am doing some data extraction from a database table: custtable. The customers have zip codes of 9 digits however I just need the first five of them. I am not sure of the syntax. Can anyone suggest me on this one?
This is what my statement is
where ((len (ct.zipcode ) > 5 and ct.country = '001')or ct.country <> '001')
This one returns customers with zipcodes > 5 and I need to only truncate this, coz my database also contains cust with zip code of only 5 digits and I have extracted that data already. Now I need all the zipcodes that have a length of 9 to be truncted to 5.
An earliest possible response is highly appreciable.
Thanks,
Rashi
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Dec 14, 2007
How to setup a sql 2005 maint plan for truncate log ?
Is there any other way to do this?
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Jul 4, 2007
i did a Stored Procedure to truncate a table. it contains lots of crap from testing the site. just a simple 1 ALTER PROCEDURE dbo.TruncateUploads
AS
TRUNCATE TABLE Uploads but it says "Cannot truncate table 'Uploads' because it is being referenced by a FOREIGN KEY constraint." then i make NULL all foreign keys and try still cannot. then i did it manually deleting all records then can! but why can't i truncate it? isn't it the same as removing all values plus having the primary keys to start from 0?
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Oct 27, 2007
How can i TRUNCATE my table (removes rows that were produced at testing), so that in the actual running the automated IDNumber for my table start with 1.
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Jan 9, 2004
Hi all,
I have a problem.
The SQL statement I have is like this
select * from table where (convert varchar(25),AMT) LIKE '%0%'
This causes all my data to appear instead of 1 only if I key 77 into the textbox because AMT is a currency type with 77.000.
So is there another way of solving this other than truncating off the zeroes?
If so feel free to assist me, your help is greatly appreciated.
Thanks.
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Sep 6, 2001
Hi
Is there a way to give a user a Truncate permission on a table without being in sysadmin role or dbo.
Thanks
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Nov 6, 2001
Hi,
I'm using SQL 7. Is there a way I can allow data to be truncated? I'm trying to insert a 50 length column into a 40 length column. I need to truncate the data to prepare for exporting to a fixed field format.
Any Suggestions?
Thanks,
Denise
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Nov 1, 2000
hi, I have two tables members table and orders table.
I have 2 records in members table and zero records in order table.
When I try to truncate members table I get an error message.
cannot truncate table members,because it is being referenced by a FOREIGN KEY constraint.
this what blows my head, There is no records in orders table. so why would the constraint enforced when there is no data in the order table. I created same table in access and I was able to delete a member from the members table. any comments.
thanks
Ahmed
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Oct 16, 2000
SQL7:
I have a 300MB db, and a transaction log near 1.3GB. Upon notification, I backed up the db log with truncate_only - no luck getting it smaller. Later, tried backup with no_log ( assuming the o/s was full - no diff)
I tried shinkfile (logfile,truncateonly) and no luck.
I tried dbcc opentrans to see if any pending trans. The db looks fine with dbcc checkdb. I managed to free up a mere 50MB. I checked the permissions on the db, and added backup db, and backup log in the db permissions for the user logged in (also tried this with sa)
I am unable to free up the space to the os. Can I somehow rid the log file and start off with a fresh log file? I need this space. As a patch I moved the log to a larger filesystem as a temporarily fix.
start/stop SQL- nothing? reboot -nothing? I played with waiting game. This log does not want to release space. The log grew from data loads.
Question1: Suggestions how to truncate this log? The contents are not really impt, but the space is.
Question2: Can I add another logfile, then use EMPTYFILE to transfer the contents to the newly added log file, then REMOVE The original logfile? In theory does this make sense?
Thanks,
Jason
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Jan 14, 2000
how do i modify this so that it will truncate the log before backup?
SQLMAINT.EXE -D mimi-BkUpDB E:SQLBackups -BkUpMedia DISK -DelBkUps 1 -Rpt E:SQLMaintmimi_maint.rpt
thanks
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Dec 24, 2002
I want to have the Transaction logs truncate on checkpoint what is the best way to do this, I take a complete backup everynight of the database. Wouldnt this set a checkpoint and clear the logs? If so it doesn't do that for me.
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Oct 7, 1999
Hello,
We have a SQL 6.5 Server with several DB's on it. Specially there's a critical DB on two separate devices for the Data and Transaction Log. The Data Device is 700MB and the Transaction Log started 210MB. Yet, the truncate function of the Log Device is not freeing space on it. We have been forced to expand the transaction device up to 860MB!!!! which is an outrageous size for it. We have tried the DBCC CHECKTABLE(syslogs)followed by DUMP TRANSACTION <<db_name>> WITH NO_LOG and then once again the DBCC CHECKTABLE(syslogs).
We even tried to create a new DB only with the dat file, but this also didn't work. Our Server Disks are almost full, and we can't grow the device no more.
Any suggestions??? PLEASE IT's REALLY URGENT!!!!
Best Regards,
BIT CeLA
Pfizer Labs.
Colombia
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Jan 18, 2002
Help......I was just handed another SQL Server database which is having problems. After taking a look at it the Transaction log is 36,173MB! I wanted to turn on the option of truncate log on checkpoint. However, there's no option like that on the options tab. The only thing I could think of is someone installed an evaluation copy of SQL Server for a production database or it's the personal edition of SQL Server. Can someone help?
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Feb 6, 2002
How do you truncate the transaction log in SQL 2000?
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Feb 13, 2002
I need to truncate the transaction log, however, to do a backup on it we need 15GB of space free on the server which we don't have. How do we just force it to truncate it? I know the actual database is backedup and is OK...
Thanks,
Keith
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Aug 1, 2001
SQL Server 6.5
Hi!
We have trans.log 200MB in total and 71 MB free space.
I run DBCC OPENTRAN and it shows no active transactions exist.
I run DuMP TRANSACTION .... WITH TRUNCATE_ONLY and it doesny clean log also.
What to do to get space back?
Thank you,
Elena.
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Mar 9, 2000
I am running a simple scheduled task each night before backup to truncate our tran log.
DUMP Transaction psychtest with TRUNCATE_ONLY
the task runs, however when checking the log space available after, it isnt changing.
Is this a reporting error? or is the log not being purged?
Ive tried running dbcc checktable(syslogs) after the truncate with no luck.
thanks,
scott
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May 5, 1999
I want to experiment with setting the Truncate Log on Checkpoint option to True to see if this will lessen the chance of my transaction log running out of space. Before I do this I want to be sure that the Transaction Log is not tied to the NT Event Log, SQL Error Log, etc. For example, does the NT Event Log (or any other log) use the Transaction Log? Thanks, Kevin.
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Oct 17, 2001
SQL Server 6.5
NT
A number of procedures where run that filled the transaction log. Can I truncate the log during regular working hours or should I take the database down to single user mode and truncate?
Thanks in advance..
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